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Finding the Fourth Proportional to 393,409.40, 590,114.10 and 389,910.20

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Solution

The fourth proportional to 393,409.40, 590,114.10 and 389,910.20 is: 584,865.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,409.40 : 590,114.10 = 389,910.20 : x
  2. Step 2: Convert to fraction form
    393,409.40/590,114.10 = 389,910.20/x
  3. Step 3: Cross multiply
    393,409.40x = 590,114.10 × 389,910.20
  4. Step 4: Simplify right side
    393,409.40x = 230,091,506,753.82
  5. Step 5: Solve for x
    x = 230,091,506,753.82/393,409.40
  6. Step 6: Final answer
    x = 584,865.30

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.